Surface strengthening guard rail for railway turnout

Abstract

The utility model provides a surface strengthening guard rail for a railway turnout. Comprising a guard rail body, and a wear-resistant layer is arranged on the guard rail working edge of the guard rail body. The wear-resistant layer and the guardrail body are tightly connected into a whole; the wear-resistant layer is a bainite steel wear-resistant layer; and the wear-resistant layer is a surface-strengthened wear-resistant layer prepared by adopting an electric arc additive manufacturing or laser cladding technology. The wear-resistant layer of the bainite steel wear-resistant layer guardrail has good compatibility with the existing guardrail body, is reasonable in design, high in strength, not easy to fall off and excellent in wear resistance, and can effectively improve the working conditions of the existing guardrail, so that the service life of the guardrail is prolonged, and the driving safety of the guardrail is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of railway guardrails, and in particular relates to a surface reinforced guardrail for railway turnouts. Background Art

[0002] Guardrails for railway switches are generally installed on the upper straight track and the lower lateral track. The guardrails limit the outward movement of the wheel backs through friction on the working edge of the guardrails, so as to guide the wheels to move forward in the set track direction, ensuring the driving safety of the train along the established route, while reducing the impact and wear on the switch heart rail.

[0003] The existing railway turnout guardrails mainly include ordinary steel rail guardrails and grooved guardrails. According to the analysis of line usage, the strength and hardness of ordinary steel rail guardrails and grooved guardrails are insufficient. The wear of the working edge of the line can reach about 3mm after one year of use, and the wear is greater than 9mm after two years of use, reaching the mandatory off-track condition, which is far from meeting the needs of users who use it for more than 4 years. Therefore, it is necessary to improve the wear resistance of the working surface of the guardrail to extend the service life of the guardrail.

[0004] In the prior art, a Chinese patent with publication number CN203034315U discloses a grooved wear-resistant guardrail for railway turnouts, wherein the guardrail is integrally rolled from alloy steel material, but has the disadvantage of excessively high overall cost of alloy steel material.

[0005] In the prior art, a Chinese patent with publication number CN211498295U discloses an improved I-shaped welded wear-resistant guardrail for railway turnouts, which improves the wear resistance of the guardrail by welding a wear-resistant strip on one side of the working edge of the guardrail head. However, the patent has the technical disadvantages that the wear-resistant strip is easy to fall off and the connection strength is insufficient.

[0006] In the prior art, the Chinese patent with publication number CN201099816Y provides a new type of wear-resistant guardrail for railway turnouts, which adopts a technical solution that a wear-resistant cladding layer as the working surface of the guardrail is provided on the guardrail body, and the wear-resistant cladding layer and the guardrail body are connected to form a whole. However, the technical solution does not mention the specific material type characteristics of the wear-resistant cladding layer, so the specific wear-resistant performance of the wear-resistant layer cannot be effectively and reliably guaranteed.

[0007] In this regard, the following improved technical solutions are proposed. Utility Model Content

[0008] The technical problem solved by the utility model is to provide a surface reinforced guardrail for railway turnout, by adding a bainite steel wear-resistant layer on the working side of the guardrail, to solve the technical problems of poor wear resistance, short service life, high manufacturing cost and low structural strength of the existing guardrail working side.

[0009] The technical solution adopted by the utility model is as follows: a surface-strengthened guardrail for railway turnouts, comprising a guardrail body, wherein the guardrail working edge of the guardrail body is provided with a wear-resistant layer; the wear-resistant layer and the guardrail body are tightly connected as a whole; the wear-resistant layer is a bainitic steel wear-resistant layer; the wear-resistant layer is a surface-strengthened wear-resistant layer made by arc additive manufacturing or laser cladding technology.

[0010] Among the above technical solutions, as the preferred technical solution of the utility model: the thickness of the wear-resistant layer is greater than or equal to 8 mm.

[0011] Among the above technical solutions, as the preferred technical solution of the utility model: after the wear-resistant layer is made by arc additive manufacturing or laser cladding technology, the guardrail is subsequently straightened and the wear-resistant layer is machined to obtain a guardrail with working edge straightness and dimensions that meet the design requirements of the drawings.

[0012] In the above technical solution: the curvature of the guardrail is not more than 1mm per meter, and the total length is not more than 2.5mm; the maximum deviation of the width of the top of the guardrail head including the wear-resistant layer is ±1.0mm.

[0013] In the above technical solution: the wear-resistant layer has a tensile strength of ≥1080MPa, an elongation after fracture of ≥10%, a cross-sectional shrinkage of ≥45%, and a Brinell hardness of 340-400HBW.

[0014] In the above technical solution, as a further improvement of the utility model: a bolt hole is formed in the middle of the waist of the guardrail body; the bolt hole connects the guardrail to the fixing device through bolts.

[0015] Among the above technical solutions, as the preferred technical solution of the utility model: the guard rail body is a groove-shaped structure or an I-shaped structure.

[0016] Among the above technical solutions, as the preferred technical solution of the utility model: the wear-resistant layer is arranged in a local area or in the entire area of ​​the working edge of the guardrail.

[0017] The advantages of this utility model compared with the prior art:

[0018] 1. The wear-resistant layer of the utility model has good compatibility with the existing guardrail body, reasonable design, high strength and excellent wear resistance, which can improve the working conditions of the existing guardrail, thereby increasing the service life of the guardrail and driving safety.

[0019] 2. The guardrail of the utility model, after the surface is strengthened and the wear-resistant layer is made, has accurate size, and the straightness and performance of the guardrail meet the requirements.

[0020] 3. The wear-resistant layer manufactured by the arc additive manufacturing of the utility model is subjected to macroscopic metallographic, microstructural, hardness and mechanical property tests, and all indicators meet the requirements for the use of turnout guardrails.

[0021] 4. The tensile strength of the wear-resistant layer of the utility model is ≥1080MPa, the elongation after fracture is ≥10%, the cross-sectional shrinkage is ≥45%, and the Brinell hardness is 340-400HBW, which meets the requirements of 4.3 in TB / T 3110-2018 "Channel Steel for 33kg / m Guard Rail".

[0022] 5. The surface-strengthened wear-resistant layer made by the arc additive manufacturing or laser cladding technology of the utility model is tightly connected to the guardrail body as a whole. From the perspective of wear resistance, the design of the wear-resistant layer significantly improves the wear resistance of the overall structure; it can enhance the mechanical properties of the guardrail body; at the same time, it can also make the wear-resistant layer have a lower friction coefficient and good lubrication performance, thereby improving the wear resistance and lubrication ability of the guardrail; the one-piece structure tightly connected as a whole also helps to simplify the installation and maintenance process.

[0023] 6. The bainitic steel wear-resistant layer of the utility model has significant advantages due to its excellent hardness, wear resistance, strength and corrosion resistance, as well as a wide range of applications and good processing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a macroscopic metallographic diagram of the wear-resistant layer of the utility model;

[0025] Figure 2 This is the microstructure diagram of the wear-resistant layer of the utility model;

[0026] Figure 3 This is a schematic diagram of the installation of the wear-resistant grooved guardrail of the utility model;

[0027] Figure 4 This is a front view of the wear-resistant grooved guardrail of the utility model;

[0028] Figure 5 It is a top view of the wear-resistant grooved guardrail of the utility model;

[0029] Figure 6 The utility model is a wear-resistant grooved guard rail Figure 4 AA section diagram in;

[0030] Figure 7 The utility model is a wear-resistant grooved guard rail Figure 4 BB section diagram in;

[0031] Figure 8 This is a schematic diagram of the installation of the wear-resistant I-shaped guardrail of the utility model;

[0032] Fig. 9 This is the front view of the wear-resistant I-shaped guardrail of the utility model;

[0033] Fig.10 It is a top view of the wear-resistant I-shaped guardrail of the utility model;

[0034] Fig.11 The utility model is a wear-resistant I-shaped guard rail Fig. 9 AA section diagram in;

[0035] Fig.12 The utility model is a wear-resistant I-shaped guard rail Fig. 9 BB section diagram in;

[0036] In the figure: 1- guardrail body, 2- wear-resistant layer, 3- working edge. DETAILED DESCRIPTION

[0037] The following will be combined with the attached embodiment of the utility model Figure 1-12 , clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0038] (like Figure 3 , Figure 8 A surface-strengthened guardrail for railway turnouts (as shown) comprises a guardrail body 1, a guardrail working edge 3 of the guardrail body 1 is provided with a wear-resistant layer 2; the wear-resistant layer 2 is tightly connected to the guardrail body 1 as a whole.

[0039] A wear-resistant layer 2 is formed so that the wear-resistant layer 2 and the guardrail body are connected as a whole. From the perspective of wear resistance, the design of the wear-resistant layer 2 significantly improves the wear resistance of the overall structure of the guardrail. Combined with the wear-resistant layer 3 material described later, it has excellent wear resistance, corrosion resistance, high temperature resistance and other characteristics, which can effectively protect the guardrail body 1 from damage caused by the external environment or working conditions. In this way, not only the service life of the guardrail is extended, but also the cost expenditure caused by frequent maintenance and replacement is reduced. In addition, the setting of the wear-resistant layer 2 can enhance the mechanical properties of the guardrail body 1; it can change the organizational structure of the material surface, thereby improving the strength, hardness and fatigue resistance of the guardrail. This strengthening effect helps to improve the bearing capacity and stability of the guardrail, so that it can better cope with various complex working environments and conditions. In addition, the tightly integrated structure makes the wear-resistant layer 2 have a lower friction coefficient and good lubrication performance, improves the wear resistance and lubrication ability of the guardrail, helps to reduce the friction and wear of the guardrail during operation, and improves the operation efficiency of the track. The one-piece structure that is tightly connected as a whole helps to simplify the installation and maintenance process. In addition, the guardrail body 1 and the wear-resistant layer 2 are tightly connected, and no additional fixings or connectors are required, which reduces the difficulty and cost of installation. At the same time, due to the protective effect of the wear-resistant layer 2 that is tightly connected as a whole, the maintenance frequency and cost of the guardrail will also be reduced accordingly.

[0040] The wear-resistant layer 2 is a bainitic steel wear-resistant layer; bainitic wear-resistant steel has high hardness and can maintain the hardness of steel under high-intensity working conditions, ensuring the high wear resistance of the guardrail working edge 3. A large amount of carbides can be evenly distributed on the surface of the wear-resistant layer 2, so that the guardrail working edge 3 not only has better wear resistance, but also has good toughness; this wear resistance has obvious advantages over other types of materials such as pearlite materials. The strength of the bainitic steel wear-resistant layer 2 is much higher than that of ordinary steel, and it can withstand heavy loads and high-intensity impacts, and can perform well in working environments that need to withstand a lot of pressure or impact. The bainitic steel wear-resistant layer has excellent corrosion resistance and can work for a long time in a humid and corrosive environment, thereby extending the service life of the guardrail and reducing maintenance costs. The bainitic steel wear-resistant layer is suitable for manufacturing consumable working edges and is used as the working edge 3 with excellent results. In addition, the bainitic steel wear-resistant layer can achieve air-cooled self-hardening, which helps to optimize the material properties, so that it can be used stably for a long time in various harsh environments, and the cost is relatively low. In summary, the bainitic steel wear-resistant layer has remarkable effects due to its excellent hardness, wear resistance, strength and corrosion resistance, as well as good processing performance.

[0041] The wear-resistant layer 2 is a surface-strengthened wear-resistant layer manufactured by arc additive manufacturing or laser cladding technology.

[0042] Among them, the wear-resistant layer 2 made by arc additive manufacturing uses wire as raw material and uses metal arc gas shielded welding (GMAW) to deposit layer by layer to produce a precise wear-resistant layer 2, with a deposition rate of up to 4 kg / hour, which helps to shorten the production time. The equipment has low cost, high material utilization rate, and is easy to achieve efficient customization of automated control, which is a more cost-effective and sustainable solution. The wear-resistant layer 2 is produced in a layer-by-layer deposition mode, with free production and no size restrictions. When the wear-resistant layer is manufactured by laser cladding, a corrosion-resistant and wear-resistant bainitic steel wear-resistant layer 2 can be laser-clad on the surface of the ordinary material rail body, significantly improving the service life of the guardrail working edge 3. In addition, through laser cladding, a high-performance alloy wear-resistant functional layer can be formed on a low-cost substrate, thereby saving material costs. The wear-resistant layer 2 produced by laser cladding technology has small deformation, good mechanical repeatability, dense interface structure, no holes, no inclusions, cracks and other defects, thereby ensuring the high quality of the cladding layer.

[0043] In summary, arc additive manufacturing and laser cladding manufacturing have their own characteristics in terms of wear-resistant layer 2 technology. The choice of which technology depends on multiple factors such as specific application scenarios, cost budget, performance requirements, and production scale. In practical applications, a comprehensive assessment is conducted based on the specific situation, and the most suitable technical solution is selected.

[0044] In the above embodiment, as a preferred embodiment of the utility model: the thickness of the wear-resistant layer 2 is greater than or equal to 8 mm, which fully meets the wear-resistant use requirements of more than 4 years.

[0045] In the above embodiment, as a preferred embodiment of the utility model: after the wear-resistant layer 2 is made by arc additive manufacturing or laser cladding technology, the guardrail is a guardrail whose working edge 3 straightness and size meet the design requirements of the drawing after subsequent straightening and machining of the wear-resistant layer. That is, the wear-resistant layer 2 is made first, and the wear-resistant layer 2 reserves enough subsequent machining allowance, so as to ensure that after the wear-resistant layer 2 is made, the dimensional accuracy and process performance of the guardrail obtained after straightening and machining meet the use requirements. In the above embodiment, the curvature of the guardrail after correction is no more than 1mm per meter, and the total length is no more than 2.5mm; regarding the dimensional accuracy requirements, the maximum deviation of the width of the top of the rail head of the guardrail including the wear-resistant layer 2 is ±1.0mm.

[0046] In the above embodiment, the wear-resistant layer 2 has a tensile strength of ≥1080 MPa, an elongation after fracture of ≥10%, a cross-sectional shrinkage of ≥45%, and a Brinell hardness of 340-400 HBW.

[0047] Specifically, the tensile strength, elongation after fracture of the wear-resistant layer 2 and the surface hardness of the working edge 3 all meet the requirements of 4.3 in TB / T 3110-2018 "Channel Steel for 33kg / m Guard Rail", see Table 1:

[0048] Table 1

[0049]

[0050] In the above embodiment, as a further improvement of the utility model: a bolt hole is formed in the middle of the waist of the guardrail body 1; the bolt hole connects the guardrail to the fixing device through bolts. In the above embodiment, as a preferred embodiment of the utility model: the guardrail body 1 is a groove structure or an I-shaped structure. In the above embodiment, as a preferred technical solution of the utility model: the wear-resistant layer 2 is set in a partial area or the entire area of ​​the working edge 3 of the guardrail.

[0051] The utility model relates to a method for manufacturing a surface-strengthened guardrail for a railway turnout, the manufacturing method being any of the aforementioned guardrails, and the manufacturing method has the following steps:

[0052] Step 1, guardrail body processing: firstly process the guardrail body 1 to the size of the guardrail design drawing, fully ensuring the size design requirements of the subsequent processing of the guardrail. Then, the guardrail body 1 is milled at the working edge 3 of the guardrail body 1 according to the process requirements of the wear-resistant layer 2, and the milling depth is used to make the wear-resistant layer 2. That is, the milling depth matches the thickness of the wear-resistant layer. Specifically, the depth of the milling of the working edge 3 of the guardrail body 1 according to the process requirements of the wear-resistant layer 2 should at least meet the minimum thickness requirement of the wear-resistant layer 2.

[0053] Step 2, bolt hole processing: Process the bolt hole in the middle of the waist of the guardrail body 1. Pre-process the bolt hole to avoid the secondary impact of the bolt hole processing on the size of the guardrail.

[0054] Step 3, arc additive manufacturing or laser cladding to obtain a wear-resistant layer: arc additive manufacturing or laser cladding technology is used to manufacture a wear-resistant layer 2 having a thickness greater than the thickness required by the wear-resistant layer process on the working edge 3 of the guardrail body 1 after milling, that is, a machining allowance is reserved for subsequent fine machining of the wear-resistant layer 2. According to actual needs, arc additive manufacturing or laser cladding technology is selected to manufacture the wear-resistant layer 2 to obtain a wear-resistant layer 2 that meets the process requirements.

[0055] Among them, arc additive manufacturing technology has significant advantages and application prospects in the preparation of wear-resistant layers. This technology uses layer-by-layer cladding to manufacture a dense metal solid wear-resistant layer 2, with arc as the energy beam, high heat input, and fast forming speed, which is suitable for low-cost, efficient and fast near-net forming. When preparing the wear-resistant layer 2, arc additive manufacturing can achieve high hardness and good wear resistance of the wear-resistant layer 2 by precisely controlling welding parameters and the movement rate of the wire. In addition, the arc additive manufacturing technology has high deposition efficiency, high wire utilization, low overall cost, and is easy to repair, which makes it have significant economic advantages in the preparation of the wear-resistant layer 2. Laser cladding is a surface modification technology that adds cladding material to the surface of the substrate and uses a high-energy-density laser beam to melt it together with a thin layer on the surface of the substrate to form a metallurgically bonded additive cladding wear-resistant layer 2. Therefore, the wear-resistant layer 2 produced by surface strengthening using any of the aforementioned process methods can be used to prepare a guardrail wear-resistant layer 2 with dense structure and good metallurgical bonding. After the surface strengthening treatment of the guardrail working surface, the strength and wear resistance of the guardrail working surface can be effectively improved, thereby improving the working conditions of the existing guardrail.

[0056] Step 4, straightening and machining of the wear-resistant layer: After straightening the guardrail body 1, the wear-resistant layer 2 is machined to the design requirements of the drawing. That is, the curvature of the guardrail after straightening is not more than 1mm per meter, and the total length is not more than 2.5mm; regarding the dimensional accuracy requirements, the maximum deviation of the width of the top of the rail head of the guardrail including the wear-resistant layer 2 is ±1.0mm.

[0057] Step 5, penetrant flaw detection acceptance of wear-resistant layer: full-length penetrant flaw detection acceptance is carried out on the machined wear-resistant layer 2. The test method of penetrant flaw detection is carried out in accordance with the provisions of GB / T 18851.1, and the acceptance is carried out according to the acceptance level 2 of GB / T 26953. The wear-resistant layer 2 shall not have defects such as cracks, slag inclusions, pores and undercuts, otherwise it shall be removed and remade.

[0058] In the above embodiment, as the preferred technical solution of the utility model: in step 3, the arc additively manufactured welding material is a bainitic steel surfacing wire, and the chemical composition and weight percentage of the bainitic steel surfacing wire are: C: 0.16-0.20%, Si: 0.26-0.31%, Mn: 1.02-1.08%, P: 0.0064-0.0069%, S: 0.0080-0.0086%, Cr: 2.10-2.16%, Ni: 0.038-0.042%, Mo: 0.35-0.39%, V: 0.0040-0.0045%, and the remainder is Fe and unavoidable impurities.

[0059] Embodiment 1: The chemical composition and weight percentage of the bainitic steel surfacing wire are: C: 0.16%, Si: 0.26%, Mn: 1.02%, P: 0.0064%, S: 0.0080%, Cr: 2.10%, Ni: 0.038%, Mo: 0.35%, V: 0.0040%, and the balance is Fe and unavoidable impurities.

[0060] Embodiment 2: The chemical composition and weight percentage of the bainitic steel surfacing wire are: C: 0.20%, Si: 0.31%, Mn: 1.08%, P: 0.0069%, S: 0.0086%, Cr: 2.16%, Ni: 0.042%, Mo: 0.39%, V: 0.0045%, and the balance is Fe and unavoidable impurities.

[0061] Optimal embodiment 3: In the above embodiments, as the optimal embodiment of the utility model: the chemical composition and weight percentage of the bainitic steel surfacing wire are: C: 0.18%, Si: 0.29%, Mn: 1.06%, P: 0.0067%, S: 0.0084%, Cr: 2.14%, Ni: 0.040%, Mo: 0.37%, V: 0.0043%, and the remainder is Fe and unavoidable impurities.

[0062] In the above embodiment, as a preferred embodiment of the utility model: in step 3, the welding process parameters of the arc additive manufacturing are: welding wire diameter 1.2mm, welding current 150~200A, welding voltage 25~30V, weld width 8~14mm, power supply connection method is DC reverse connection, weld overlap is 1 / 3~1 / 2 weld width, and it is swing arc welding.

[0063] Specifically: the wear-resistant layer 2 is prepared on the working edge 3 using the welding process parameters in Table 2, and the thickness of the wear-resistant layer 2 should have an organic processing allowance.

[0064] Table 2

[0065]

[0066] The welding process parameters of the arc additive manufacturing of the utility model adopt common specifications for the wire diameter of 1.2mm to meet various welding scenarios. The welding current range of 150-200A and the welding voltage range of 25-30V are determined by multiple experiments based on the required wire diameter, material thickness, welding speed and the required weld quality. The welding current and voltage are determined according to the specific welding material composition and process described above to achieve the best welding effect. The weld bead width of 8-14mm adopts a relatively large range, and the weld bead overlap is 1 / 3-1 / 2 of the weld bead width, which helps to ensure the continuity and strength of the weld. The DC reverse connection welding power supply connection method is conducive to removing oxides from the molten pool and improving the quality of the weld. Swinging arc welding can control the shape and size of the molten pool by adjusting the swing amplitude and frequency, reduce welding defects, and improve the uniformity and density of the weld. In addition, the swinging action helps to increase the width of the weld, make the weld fuller, and improve the strength of the welded joint. By controlling the swing amplitude and frequency, swing arc welding can speed up the welding speed and improve the welding efficiency, which is especially suitable for large-scale and high-efficiency production scenarios. Therefore, the use of swing arc welding technology can achieve high-quality welding.

[0067] In the above embodiment, as a preferred embodiment of the utility model: in step 3, when the arc additive manufacturing technology is used to prepare the wear-resistant layer 2, a welding cart and a small gas shielded welding machine are used to complete the surfacing of the wear-resistant layer 2. Using a welding cart, a wear-resistant layer 2 with a minimum thickness of not less than 8 mm is prepared by arc additive manufacturing, and a small gas shielded welding machine can be used to complete the surfacing of the wear-resistant layer without the need for large-scale special welding equipment; surfacing with the help of a welding cart has low labor intensity, simple operation, easy to master the process method, and low requirements for welding operators.

[0068] In the above-mentioned embodiment, as a preferred embodiment of the utility model: in step 4, a top bending machine is used to straighten the guardrail body 1. The curvature of the guardrail after the top bending machine is no more than 1 mm per meter, and the total length is no more than 2.5 mm. The top bending machine can quickly adjust the curvature of the guardrail through automated operation and high-speed processing, and realize fast and efficient straightening processing of the guardrail. Compared with traditional manual or other straightening methods, it significantly improves production efficiency and saves working hours and labor costs. Furthermore, the top bending machine has precise adjustment capabilities and can accurately control the curvature and straightening of the guardrail; by adjusting the fixture and mold of the machine, it can ensure that the straightened guardrail fully matches the design requirements, with accurate shape and precise size. During the straightening process, the top bending machine can avoid excessive stretching or damage to the guardrail by controlling the processing parameters, thereby maintaining the strength and performance of the guardrail.

[0069] From the above description, it can be found that the bainite steel wear-resistant layer 2 of the utility model has good compatibility with the existing guardrail body, reasonable design, high strength and good wear resistance, can improve the working conditions of the existing guardrail, thereby increasing the service life of the guardrail and driving safety.

[0070] The utility model has the advantages of accurately maintaining the straightness of the guardrail after the wear-resistant layer 2 is made by surface strengthening, and the performance meets the use requirements. In the method and process, a small gas shielded welding machine can be used to complete the wear-resistant layer surfacing, and no large-scale special welding equipment is required. Surfacing is performed with the help of a welding trolley, which has low labor intensity, simple operation, easy to master and implement the process method, and low requirements for welding operators.

[0071] The utility model uses arc additive manufacturing to perform macroscopic metallographic ( Figure 1 )、Microstructure( Figure 2 ), hardness and mechanical properties tests are shown in Table 3. All indicators meet the requirements for the use of turnout guardrails.

[0072] Table 3

[0073]

[0074]

[0075] In addition, the setting of the welding process parameters of arc additive manufacturing, the setting of the welding wire diameter, the welding current and the welding voltage in the relevant method of the utility model can obtain the best welding effect; the weld bead width helps to ensure the continuity and strength of the weld; the power supply connection method is conducive to removing oxides in the molten pool and improving the weld quality; the swing arc welding effectively improves the welding quality, helps to increase the width of the weld, and at the same time can speed up the welding speed and improve the welding efficiency.

[0076] The tensile strength of the wear-resistant layer 2 of the guardrail of the utility model is ≥1080MPa, the elongation after fracture is ≥10%, the cross-sectional shrinkage is ≥45%, and the Brinell hardness is 340-400HBW, which meets the requirements of 4.3 in TB / T3110-2018 "Channel Steel for 33kg / m Guardrail".

[0077] The surface-strengthened wear-resistant layer 2 manufactured by the utility model through arc additive manufacturing or laser cladding technology is tightly connected to the guardrail body 1 as a whole. From the perspective of wear resistance, the design of the wear-resistant layer 2 significantly improves the wear resistance of the overall structure; the mechanical properties of the guardrail body can be enhanced; not only that, the guardrail body 1 and the wear-resistant layer 2 are tightly connected as a whole structure, which also makes the wear-resistant layer 2 have a lower friction coefficient and good lubrication performance, thereby improving the wear resistance and lubrication ability of the guardrail; in addition, the one-piece structure tightly connected as a whole helps to simplify the installation and maintenance process.

[0078] The bainite steel wear-resistant layer 2 of the utility model has significant advantages over other materials due to its excellent hardness, wear resistance, strength and corrosion resistance, as well as good processing performance.

[0079] In summary, the utility model solves the technical problems of poor wear resistance and short life of the guardrail. With the utility model guardrail, the wear-resistant layer 2 has excellent process performance and high strength, which effectively improves the working conditions of the existing guardrail, thereby increasing the service life of the guardrail and driving safety.

[0080] Each embodiment in this specification is described in a related manner, and the same or similar parts between the embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0081] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification and equivalent replacement made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A surface-strengthened guardrail for railway turnout, comprising a guardrail body (1), characterized in that: The guardrail working edge (3) of the guardrail body (1) is provided with a wear-resistant layer (2); the wear-resistant layer (2) and the guardrail body (1) are tightly connected to form a whole; the wear-resistant layer (2) is a bainitic steel wear-resistant layer.

2. The guard rail according to claim 1, characterized in that: The wear-resistant layer (2) has a thickness greater than or equal to 8 mm.

3. The guard rail according to claim 1, characterized in that: The curvature of the guard rail is no more than 1 mm per meter, and the total length is no more than 2.5 mm; the maximum deviation of the width of the top of the rail head of the guard rail including the wear-resistant layer (2) is ±1.0 mm.

4. The guard rail according to claim 1, characterized in that: A bolt hole is formed in the middle of the waist of the guardrail body (1); the bolt hole connects the guardrail to the fixing device via bolts.

5. The guard rail according to claim 1, characterized in that: The guard rail body (1) is a groove-shaped structure or an I-shaped structure.

6. The guard rail according to claim 1, characterized in that: The wear-resistant layer (2) is arranged in a local area or in the entire area of ​​the working edge (3) of the guardrail.

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